Preparation of aliphatic halofluoro compounds



Sept. 3, 1935. T. MIDGLEY. JR., El AL 2,013,062

PREPARATION OF ALIPHATIC HALO-FLUORO COMPOUNDS I Original Filed Feb. 26, 1931 II. I]

E: nqVENToks Y a dtq provide, eflicient and economical methods of man- I reactions of. the

Patented 3, 1955 PREPARATION OF ALIPHATIO HALO- FLUORO CQDIPOUNDS Thomas Midgley, In, Worthington, and Albert L. Henne, Columbus, Ohio, assignors to Frigidaire Corporation, Dayton, Ohio, a corporation of Delaware Application February 26,1931, semi No. 518,489 Benewed' June 27, 1934 5 (Cl. 260-162) I This invention relates to a method oi! manuiacturing fluoro and/or halo-fluoro aliphatic hydrocarbon derivatives.

The principal objects oi. the invention are to ufacture of fluoro and/or halo-fluoro aliphatic hydrocarbon derivatives.

- This invention comprises the interaction of a metal fluoride, a halogen derivative of an, allphatic hydrocarbon, and an antimony salt. Where the antimony salt is also a catalyst as where a 'pentavalent antimony salt is. used, the reaction proceeds. Where the antimony salt is not also a. catalyst, 1- supply another substance as a catalyst.

- A: specific example of the reactants-and the first type is represented by the equation:

A specific example of the reactants and reactionsot the second type is represent by the equation: t

ThecaFz and the KFare examples of metal f fluorides. The carbon tetrachloride is a common example of a halogen derivative of an aliphatic hydrocarbon. Such derivatives include compounds belonging to the ethane, propane, ethylene, etc. series, among which may be named C2Clc, CaI-IzCIs. 1, 4, CH0]; and CHBrr. By fluorating such compounds there are obtained halo and/or halo-fluoro derivativesoi' the aliphatlc hydrocarbons such as CzFlClz, CaHzClaFa. CzClaF;

CHClsI', and CHBn-F.

The antimony saltnamed in the second ex ample is a sulfate but other salts such as antimony trichloride may be useiL Also, in the second example,. where chlorine is named as the catalyst, other catalysts such as. antimony pentachloride may be employed.

v The limiting or the reactions to obtain a'high yield oi. any particular product desired and. the

minimizing or side reactions are promoted by employing compounds relativeLv free iron: film'- purities and more particularly relatively free from yield are given.

Various forms of apparatus may be employed to carry out the present invention. One form ot apparatus is illustrated because it can be operated'emciently for limitingthe products to any one fluoride desired. The figure oi the drawing is a diagrammatic illustrationoithis apparatus. Calcium fluoride and antimony sulfate, together with ,a small quantity of catalyst (antimony pentachloride), are introduced through the opening 2| into the autoclave 20, where the fluoration zone is maintained. The opening is closed; The carbon tetrachloride, stored in the tank 22,- is introduced into the autoclave 20 by any suitable means such as the'pump Q3. The reaction then proceeds, and, if desired, its rate may be controlled bya temperature control jacket 24. In this-particular instance, the autoclave is kept at about176 F. I

The pressure within the autoclave 20 is allowed to build up to about pounds to obtain the desired fractionation conditions in the column 25. The dephlegmator 26 is' maintained at about F. to F. This permits the passage of dichlorodifluoromethane and refluxes the insuiliciently fluorated products monofluorotrichloromethane and unacted upon carbon tetra.- chloride, In this particular'ease the dichlorodifluoromethane is discharged through the pipe 2 1, and is washed by passing it through a sodium .hydroxide solution in the washers II and II. This derivative (GChFz) is taken from the washers and or stored in any suitable manner. It

may be compressed by thecompr'essor II driven by the motor 3| which discharges the compressed derivative into thgreceiver 32. I A high yield (Tithe desired fluorof-halo derivative is obtainedlby returning-to thej fluoration zone any insufllciently viluorated hydrocarbon derivatives tor turther fluoratlon, and by removing or releasing from such zone the adequately fluorated derivative.- r

What is claimed is as follows:

1 'The process-comprising interacting a, 'metal iiuorideother'than antimony, an aliphatic hyj drocarbon halogen derivative containing halogen other than'fluorine, and an antimony salt other carbon halogen derivative containin: haloeen other than fluorine. and a pentavn-lent. antimony salt other than a fluoride to ionn an aliphatic I aoiaooa fluoride other than an aliphatic hydro- 4. Hie which interacting a -inetai' fluoride-other. than antimony, a methone halocen derivative halogen other than fluorine. and a pentavaient antimony salt a flnoro-halo derivative.

ane derivative.

5. The process which comprises calcium fluoride. carbon tetrachloride'and antimony 8. Theprocess which comprises interactina a metal fluoride other than antimony. amethane haloeen derivative containine haioeen other than fluorine. and an antimony salt other than a fluoride to torln a halo-fluoro derivative otmeth- I cm'rlr clmo r' connlzc'nofig I Patent No.. 2,013,061 s m'nnber 3.193s.

' moms iniioln r,1 n.,'- 51" L I It is hereby certified that theabove nmnbered'patentwas issued to 1; v "Frigidaire Corporation,v of Dayton, Ohio; a corporation of Delaware. whereas-said 'patent should have been issued toG'eneraiMotors Corporation, a corporation of u Delaware, as assignee by m'esne assignmentsof the entire interest in said invention,

other than a fluoride to. term a halo-nuoro rneth- I as shown by the records of, assignments in this office; and that thels a id-Letters Patent should'be read with this correction therein that the =-;nmtymrom.'.mm= record of thecase in the Patent Qiiice. Y v

Signed and sealed this 19th dayoi November. 'D. 1935. 1

Leslie Frazer.

(Seal) I .Ac-ting Conimi'ssioner of Patent; I

carbon halogen derivative containin: haloeen other than fluorine. and a pentavn-lent. antimony salt other than a fluoride to ionn an aliphatic I aoiaooa fluoride other than an aliphatic hydro- 4. Hie which interacting a -inetai' fluoride-other. than antimony, a methone halocen derivative halogen other than fluorine. and a pentavaient antimony salt a flnoro-halo derivative.

ane derivative.

5. The process which comprises calcium fluoride. carbon tetrachloride'and antimony 8. Theprocess which comprises interactina a metal fluoride other than antimony. amethane haloeen derivative containine haioeen other than fluorine. and an antimony salt other than a fluoride to torln a halo-fluoro derivative otmeth- I cm'rlr clmo r' connlzc'nofig I Patent No.. 2,013,061 s m'nnber 3.193s.

' moms iniioln r,1 n.,'- 51" L I It is hereby certified that theabove nmnbered'patentwas issued to 1; v "Frigidaire Corporation,v of Dayton, Ohio; a corporation of Delaware. whereas-said 'patent should have been issued toG'eneraiMotors Corporation, a corporation of u Delaware, as assignee by m'esne assignmentsof the entire interest in said invention,

other than a fluoride to. term a halo-nuoro rneth- I as shown by the records of, assignments in this office; and that thels a id-Letters Patent should'be read with this correction therein that the =-;nmtymrom.'.mm= record of thecase in the Patent Qiiice. Y v

Signed and sealed this 19th dayoi November. 'D. 1935. 1

Leslie Frazer.

(Seal) I .Ac-ting Conimi'ssioner of Patent; I 

